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p in (-oo:+oo)
12/11 = p/9 // - p/9
12/11-(p/9) = 0
12/11-1/9*p = 0 // - 12/11
-1/9*p = -12/11 // : -1/9
p = -12/11/(-1/9)
p = 108/11
p = 108/11
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